JP2019167868A - Drive control device and vehicle - Google Patents

Abstract

Provided is a drive control device and a vehicle capable of improving the occupant's feeling when an accelerator opening value changes. A drive control device is a drive control device for a vehicle that outputs a driving force of a drive source in accordance with a speed ratio, a speed ratio obtaining unit that obtains a speed ratio of a running vehicle, and an accelerator opening. A drive control unit that controls the output of the drive source of the vehicle based on the value, the drive control unit acquires when the accelerator opening value changes while the vehicle is running at the acquired gear ratio. The change in the output of the drive source is made slower as the speed change ratio is larger. [Selection diagram] Fig. 1

Description

  The present disclosure relates to a drive control device and a vehicle.

  2. Description of the Related Art Conventionally, in a vehicle, a configuration is known in which the output of a driving source of a vehicle is controlled based on a depression amount (accelerator opening value) of an accelerator pedal (see, for example, Patent Document 1).

JP 2011-255711 A

  By the way, in a vehicle having a plurality of gears, the gear ratio of the gears increases as the speed decreases. Therefore, if the accelerator opening value changes while the vehicle is traveling at a low speed gear stage, the amount of fluctuation in the driving force of the vehicle before and after the change of the accelerator opening value becomes larger than at the high speed gear stage. . As a result, there is a problem that the occupant's feeling deteriorates, such as the occupant feeling jerky.

  An object of the present disclosure is to provide a drive control device and a vehicle that can improve the occupant's feeling when the accelerator opening value changes.

The drive control device of the present disclosure includes:
A drive control device for a vehicle that outputs a drive force of a drive source according to a gear ratio,
A gear ratio acquisition unit for acquiring a gear ratio of the vehicle during traveling;
A drive control unit for controlling the output of the drive source of the vehicle based on an accelerator opening value;
With
When the accelerator opening value changes when the vehicle is traveling at the acquired gear ratio, the drive control unit slows down the output change of the drive source as the acquired gear ratio increases.

The vehicle of the present disclosure is
The drive control apparatus described above is provided.

  According to the present disclosure, it is possible to improve the occupant's feeling when the accelerator opening value changes.

It is a figure showing composition of vehicles provided with a drive control device concerning an embodiment of this indication. It is a figure which shows the time change of an accelerator opening value. It is a figure which shows the time change of the output value of an engine. It is a figure which shows the time change of an accelerator opening value. It is a figure which shows the time change of the output value of an engine. It is a flowchart which shows the operation example of the drive control in a drive control apparatus.

  Hereinafter, the present embodiment will be described in detail with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a vehicle 1 including a drive control device 100 according to an embodiment of the present disclosure.

  As shown in FIG. 1, the vehicle 1 includes a propeller shaft 2, a differential gear 3, drive wheels 4, an engine 5 as an example of a drive source, a transmission 6, an accelerator sensor 7, and a rotation speed detection unit 8. And a drive control device 100.

  The engine 5 is an internal combustion engine such as a diesel engine. The power of the engine 5 is transmitted to the transmission 6 via a clutch (not shown), and the power transmitted to the transmission 6 is transmitted to the drive wheels 4 via the propeller shaft 2 and the differential gear 3.

  The transmission 6 is a manual transmission, for example, and constitutes a plurality of shift stages. In other words, the transmission 6 includes a transmission mechanism that connects or disconnects the output shaft of the engine 5 and the propeller shaft 2.

  The accelerator sensor 7 detects the accelerator opening value of the vehicle 1.

  The rotation speed detection unit 8 detects the output rotation speed of the engine 5 and the output rotation speed of the transmission 6.

  The drive control device 100 is, for example, an electronic control unit, and includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an input / output circuit (not shown). The drive control device 100 is configured to control the output of the engine 5 based on a preset program. The drive control device 100 corresponds to the “transmission ratio acquisition unit” and the “drive control unit” of the present disclosure.

  The drive control apparatus 100 acquires the accelerator opening value of the vehicle 1 from the accelerator sensor 7, and determines the target output value of the engine 5 based on the accelerator opening value. The drive control device 100 controls the output of the engine 5 so as to achieve the target output value. Examples of the control of the output of the engine 5 include that the fuel injection amount is controlled.

  Specifically, the drive control device 100 determines the target output value of the engine 5 within the period based on the accelerator opening value within the period from the first time to the second time after a predetermined time has elapsed. And the drive control apparatus 100 controls the output of the engine 5 so that it may become a target output value in the said period.

  Moreover, the drive control apparatus 100 determines the target output value of the engine 5 every predetermined time. The accelerator opening value changes depending on the depression amount of the accelerator pedal of the driver of the vehicle 1. Therefore, a target output value is determined every predetermined time, and the output of the engine 5 is controlled so that the target output value becomes the target output value each time, so that the output of the engine 5 can be controlled according to the change in the accelerator opening value. Will be done.

  Next, an example of determining the target output value of the engine 5 of the drive control device 100 will be described. FIG. 2A is a diagram showing a time change of the accelerator opening value. FIG. 2B is a diagram showing a change over time in the output value of the engine 5. FIG. 2A shows a time change of the accelerator opening value when the accelerator opening value changes from A0 to A1 at time t1.

  First, as shown in FIG. 2A, the drive control device 100 sets the accelerator opening value within a period from time t1 (first time) to time t2 (second time) after the first time (predetermined time) has elapsed. Based on this, the target output value of the engine 5 is determined. This target output value is the target output value of the engine 5 within the period from time t1 to time t2 (second time) after the first time has elapsed.

  For example, the drive control apparatus 100 calculates an accelerator opening value within a period from time t1 to time t2, and refers to a map in which the accelerator opening value and the output value of the engine 5 are associated with each other from a storage unit or the like. The output value of the engine 5 corresponding to the accelerator opening value is read out. In FIG. 2A, all accelerator opening values within the period from time t1 to time t2 are A1. In the following description, the target output value corresponding to the accelerator opening value A1 is E1, and the target output value corresponding to the accelerator opening value A0 is E0.

  Then, as shown in FIG. 2B, the drive control apparatus 100 determines that the target output value of the engine 5 within the period from the time t1 to the time t2 after the first time elapses is E1, and the output value becomes E1. Next, the output of the engine 5 is controlled (see the solid line).

  The target output value within the period from time t1 to time t2 is E0, which is the target output value calculated from the accelerator opening value A0 before time t1. Therefore, the output of the engine 5 changes from E0 to E1 from the time t1 to the time t2 when the fuel injection amount is controlled.

  After time t2, the target output value of the engine 5 is determined by the same method based on the accelerator opening value after time t2. In this way, the target output value is controlled following the change in the accelerator opening value. 2A and 2B show an example in which the target output value is determined at the time t1 for convenience.

  Further, when the accelerator opening value changes while the vehicle 1 is traveling, the drive control device 100 makes the output change of the engine 5 duller as the gear ratio of the gear stage connected to the transmission 6 at that time increases. .

  As shown in FIG. 2A, when the accelerator opening value changes abruptly at the time t1, the gear ratio increases as the gear position connected to the transmission 6 at that time becomes lower. The amount of change in driving force increases. For this reason, when the output of the engine 5 is controlled following the change in the accelerator opening value, the occupant's feeling may be deteriorated, for example, the occupant may feel a jerky feeling.

  Therefore, in the present embodiment, the output change of the engine 5 becomes duller as the gear position becomes lower. Specifically, the drive control device 100 increases the predetermined time, which is the time until the target output value is reached, as the gear ratio of the gear stage is larger.

  For example, as shown in FIG. 2A, when the predetermined time is the second time that is twice the first time, the drive control device 100 calculates the accelerator opening value within the period from time t1 to time t3. Since the accelerator opening value is all A1 during this period, the target output value of the engine 5 during the period from time t1 to time t3 after the second time has elapsed is E1.

  Then, as shown in FIG. 2B, the drive control apparatus 100 controls the output of the engine 5 so that the output value changes from E0 to E1 within the period from time t1 to time t3 (see the broken line). If the predetermined time is lengthened, the period during which the output value of the engine 5 changes (predetermined time) becomes longer, and accordingly, the time change amount of the output of the engine 5 becomes smaller than that in the case of the solid line. In other words, the drive control apparatus 100 decreases the amount of time change in the output of the engine 5 as the gear ratio of the shift speed is larger.

  As a result, the output of the engine 5 fluctuates gently, so that the degree of occupant feeling jerky is reduced even when the shift speed is low. In other words, the occupant's feeling can be improved.

  In addition, the drive control device 100 acquires the output rotational speed of the engine 5 and the output rotational speed of the transmission 6 from the rotational speed detection unit 8. The drive control device 100 determines at which gear stage the vehicle 1 is traveling based on these output rotation speeds. In this way, the drive control device 100 determines the gear position, thereby acquiring the gear ratio during which the vehicle 1 is traveling and adjusting the predetermined time. It should be noted that the gear stage may be acquired by any method as long as the gear stage in which the vehicle 1 is traveling can be acquired. For example, the gear stage may be acquired by a position sensor or the like.

  The control in the present embodiment is also effective when the accelerator opening value increases or decreases in a short time. FIG. 3A is a diagram showing a time change of the accelerator opening value. FIG. 3B is a diagram showing a change over time in the output value of the engine 5. FIG. 3A shows the time change of the accelerator opening value when the accelerator opening value changes from A0 to A1 at time t11 and then changes to A0 at time t12 after the first time has elapsed. ing.

  First, an example in which the target output value is determined with the predetermined time as the first time will be described. As shown in FIG. 3A, the drive control device 100 is based on the accelerator opening value within a period from time t11 (first time) to time t12 (second time) after the first time (predetermined time) has elapsed. The target output value of the engine 5 is determined.

  Since the accelerator opening values in the period from time t11 to time t12 are all A1, the target output value in the period from time t11 to time t12 after the elapse of the first time is set to E1 (FIG. 2A). In the period from time t1 to time t2). Therefore, as shown in FIG. 3B, the output of the engine 5 changes from E0 to E1 from time t11 to time t12 (see the solid line).

  As shown in FIG. 3A, the drive control device 100 during that time period, based on the accelerator opening value in the period from time t12 to time t13, in the period from time t12 to time t13 after the first time elapses. A target output value of the engine 5 is calculated. Since the accelerator opening values during this period are all A0, the target output value within the period from time t12 to time t13 is set to E0. Therefore, as shown in FIG. 3B, the output of the engine 5 changes from E1 to E0 from time t12 to time t13 (see solid line).

  Next, an example in which the target output value is calculated using the predetermined time as the second time will be described. As shown in FIG. 3A, the drive control apparatus 100 is based on the accelerator opening value within a period from time t11 (first time) to time t13 (second time) after the second time (predetermined time) has elapsed. The target output value of the engine 5 is determined. The accelerator opening value in the period from time t11 to time t12 is A1, and the accelerator opening value in the period from time t12 to time t13 is A0. That is, within the second time, the time changes from A1 to A0 at the time t12.

  Therefore, the drive control device 100 first sets the engine 5 so that it becomes the target output value E1 corresponding to the accelerator opening value A1 within the period from time t11 to time t13 within the period from time t11 to time t12. Is changed (see broken line). In FIG. 3B, when the output of the engine 5 is changed so as to be the target output value E1 corresponding to the accelerator opening value A1 within the period from the time t11 to the time t13, at the time t12, An example in which the output value of the engine 5 is E2 is illustrated.

  Then, since the accelerator opening value changes from A1 to A0 at time t12, the drive control device 100 switches the target output value from E1 to E0 corresponding to the accelerator opening value A0. Change the output. Thereby, in the period from time t12 to time t13, the output value of the engine 5 changes from E2 to E0.

  Thus, when the accelerator opening value increases or decreases in a short time, it is considered that the vehicle 1 does not need to be accelerated much. Therefore, in this case, if the output of the engine 5 is made to accurately follow the change in the accelerator opening value, the fluctuation in the driving force output from the transmission 6 increases as the gear position becomes lower. It becomes easier to remember (see the solid line in the period from time t11 to time t13 in FIG. 3B).

  However, in such a case, it is possible to easily consider the amount of decrease in the accelerator opening value (period from time t12 to t13 in FIG. 3A) by performing control to increase the predetermined time. The maximum value of the change amount can be kept small. As a result, it is possible to reduce the occupant's feeling of jerkyness and thus improve the occupant's feeling.

  Further, the drive control device 100 may determine whether or not to execute control for reducing the output of the engine 5 based on the time change amount of the accelerator opening value.

  The amount of change in time varies depending on the degree of depression of the accelerator pedal. For example, when the occupant depresses the accelerator pedal strongly, the amount of time change in the accelerator opening value changes abruptly as in the examples shown in FIGS. 2A and 3A, but when the occupant slowly depresses the accelerator pedal, The amount of time change in the accelerator opening value changes gradually. When the time change amount of the accelerator opening value changes gradually, it is considered that even if the gear ratio of the gear stage is large, the feeling of the occupant is not significantly affected.

  Therefore, in such a case, the drive control apparatus 100 determines not to execute control that makes the output change of the engine 5 blunt. Thereby, the control which makes the output change of the engine 5 blunt can be performed only when necessary.

  An operation example of drive control in the drive control apparatus 100 configured as described above will be described. FIG. 4 is a flowchart illustrating an example of operation of drive control in the drive control apparatus 100. The process in FIG. 4 is repeatedly executed while the vehicle 1 is traveling, for example.

  As shown in FIG. 4, the drive control apparatus 100 acquires the accelerator opening value and determines whether or not there is a change in the accelerator opening value (step S101). As a result of the determination, when there is no change in the accelerator opening value (step S101, NO), the process transitions to step S104.

  On the other hand, when there is a change in the accelerator opening value (step S101, YES), the drive control device 100 acquires the output rotational speed of the engine 5 and the output rotational speed of the transmission 6, and based on the output rotational speed, the vehicle The first gear is determined (step S102).

  Next, the drive control apparatus 100 sets a predetermined time based on the determined shift speed (step S103). Specifically, the drive control apparatus 100 lengthens the predetermined time as the gear ratio of the shift speed increases. Thereby, the amount of change in the output value of the engine 5 per unit time is set based on the gear position.

  Next, the drive control apparatus 100 calculates the target output value of the engine 5 (step S104). Next, the drive control apparatus 100 controls the output of the engine 5 based on the target output value (step S105). Thereafter, this control ends.

  According to the present embodiment configured as described above, when the accelerator opening value changes when the vehicle 1 is traveling at a predetermined gear, the output of the engine 5 increases as the gear ratio of the predetermined gear increases. Slow change. Specifically, as the speed ratio of the predetermined gear stage is larger, the amount of time change of the output value of the engine 5 is reduced, so that the output of the engine 5 can be gradually changed. As a result, the degree to which the occupant feels jerky is reduced, and as a result, the occupant's feeling can be improved.

  Moreover, since the output change of the engine 5 becomes dull as the gear ratio of the predetermined gear stage is larger, it is possible to calculate a target output value that takes into account the increase or decrease of the accelerator opening value in a short time. As a result, the maximum value of the output value of the engine 5 can be reduced, and consequently the occupant's feeling can be improved.

  In the above embodiment, the engine 5 is exemplified as the drive source. However, the present disclosure is not limited to this, and in the case of an electric vehicle or the like, a motor may be used as the drive source. In that case, the drive control apparatus 100 controls the output of the motor by adjusting the current supplied to the motor.

  Moreover, in the said embodiment, although the vehicle provided with the stepped transmission which has a several gear stage was illustrated, this indication is not limited to this, A vehicle provided with a continuously variable transmission may be sufficient.

  In addition, each of the above-described embodiments is merely an example of implementation in carrying out the present disclosure, and the technical scope of the present disclosure should not be construed in a limited manner. That is, the present disclosure can be implemented in various forms without departing from the gist or the main features thereof.

  The drive control device of the present disclosure is useful as a drive control device and a vehicle that can improve the occupant's feeling when the accelerator opening value changes.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Propeller shaft 3 Differential gear 4 Drive wheel 5 Engine 6 Transmission 7 Acceleration sensor 8 Rotation speed detection part 100 Drive control apparatus

Claims (6)

A drive control device for a vehicle that outputs a drive force of a drive source according to a gear ratio,
A gear ratio acquisition unit for acquiring a gear ratio of the vehicle during traveling;
A drive control unit for controlling the output of the drive source of the vehicle based on an accelerator opening value;
With
When the accelerator opening value changes when the vehicle is running at the acquired gear ratio, the drive control unit slows down the output change of the drive source as the acquired gear ratio is larger.
Drive control device. The drive control unit reduces the time change amount of the output of the drive source as the speed ratio is larger.
The drive control apparatus according to claim 1. The drive control unit
Determining a target output value of the drive source within the period based on the accelerator opening value within a period from a first time to a second time after a predetermined time has elapsed;
Controlling the output of the drive source to be the target output value within the period,
The predetermined time is lengthened as the gear ratio is larger.
The drive control apparatus according to claim 1 or 2. The drive control unit determines a target output value of the drive source every predetermined time;
The drive control apparatus according to claim 3. The drive control unit determines whether or not to execute control to reduce the change in the output of the drive source based on the time change amount of the accelerator opening value.
The drive control apparatus of any one of Claims 1-4. The drive control device according to claim 1 is provided.
vehicle.

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